JP6197904B1 - Horn sound generator - Google Patents

Horn sound generator Download PDF

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Publication number
JP6197904B1
JP6197904B1 JP2016061618A JP2016061618A JP6197904B1 JP 6197904 B1 JP6197904 B1 JP 6197904B1 JP 2016061618 A JP2016061618 A JP 2016061618A JP 2016061618 A JP2016061618 A JP 2016061618A JP 6197904 B1 JP6197904 B1 JP 6197904B1
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Prior art keywords
iron core
movable iron
diaphragm
fulcrum
center
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JP2017173688A (en
Inventor
寿信 井野
寿信 井野
郁代 大杉
郁代 大杉
範之 鍋島
範之 鍋島
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マツダ株式会社
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES TYRE INFLATION; TYRE CHANGING OR REPAIRING; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C5/00Inflatable pneumatic tyres or inner tubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q5/00Arrangements or adaptations of acoustic signal devices
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/02Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
    • G10K11/04Acoustic filters ; Acoustic resonators
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooter, buzzer
    • G10K9/12Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooter, buzzer electrically operated
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooter, buzzer
    • G10K9/12Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooter, buzzer electrically operated
    • G10K9/13Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooter, buzzer electrically operated using electromagnetic driving means
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooter, buzzer
    • G10K9/18Details, e.g. bulbs, pumps, pistons, switch, casing
    • G10K9/20Sounding members
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooter, buzzer
    • G10K9/18Details, e.g. bulbs, pumps, pistons, switch, casing
    • G10K9/22Mountings; Casings

Abstract

A sound source device for a horn that outputs chords from one diaphragm is provided. Resonating with a diaphragm 11, a movable iron core 12 connected to the diaphragm 11 via a fulcrum 121a, a first signal component resonating with the diaphragm 11, and a movable iron core 12 having a first frequency; And a coil (bobbin 14 and winding 15) to which a drive signal including a first signal and a second signal component of a second frequency having a chordal relationship is input. The fulcrum 121a is provided at a position eccentric from the center O of the diaphragm 11, and the movable iron core 12 is configured such that the center of gravity G is shifted in the eccentric direction D1 from the fulcrum 121a. [Selection] Figure 1

Description

  The present invention relates to a sound source device for a horn mounted on a vehicle.
  A vehicle is equipped with a horn that vibrates a diaphragm with a movable iron core and outputs sound generated by the diaphragm to the outside through a resonance tube. Since the resonance tube has a spiral shape, there is a problem that it cannot be removed if foreign matter such as water enters and accumulates in the resonance tube. Therefore, Patent Document 1 discloses a vehicular electric horn in which a foreign object intrusion preventing member is attached to a sound wave outlet opening of a resonance tube to prevent foreign objects flying from the front of the vehicle from entering the resonance tube.
JP 2011-76018 A
  By the way, if the sound output from the horn is made into a chord, it is considered that a comfortable sound is output for the occupant, and driving pleasure is increased. As a technique for realizing the output of a chord, for example, a technique of providing a plurality of horns that output sounds having different frequencies can be considered.
  However, since there are a plurality of horns in this method, there is a problem that cost and weight increase. Moreover, since the installation space of a horn in a vehicle is limited, it is not preferable to provide a plurality of horns.
  Moreover, since patent document 1 is an invention which prevents the penetration | invasion of a foreign material, it cannot output a chord using one horn.
  An object of the present invention is to provide a sound source device for a horn that outputs chords from one diaphragm.
A sound source device according to one aspect of the present invention is a sound source device of a horn mounted on a vehicle,
A diaphragm,
A movable iron core connected to the diaphragm via a fulcrum;
A drive signal including a first signal component of a first frequency that resonates with the diaphragm and a second signal component of a second frequency that resonates with the movable iron core and has a chordal relationship with the first frequency is input. And a coil for driving the movable iron core,
The fulcrum is provided at a position eccentric from the center of the diaphragm,
The movable iron core is configured such that the center of gravity is shifted in the eccentric direction of the fulcrum from the fulcrum.
  According to this aspect, the diaphragm resonates at the first frequency, and the first sound is output. The movable iron core resonates at the second frequency and vibrates so that the center of gravity swings around the fulcrum. Here, since the fulcrum is eccentric from the center of the diaphragm, in the diaphragm, the amplitude of the region on the eccentric direction side (first region) with respect to the fulcrum is a region opposite to the eccentric direction with respect to the fulcrum (first region). It becomes larger than the amplitude of the second region). As a result, in the diaphragm, the vibrations of the second frequency in the first region and the second region become asymmetric and do not cancel each other, and the second sound is output.
  However, this alone cannot provide a second sound with a sufficient sound pressure because the area of the first region is small. Therefore, in this aspect, the center of gravity of the movable iron core is shifted in the eccentric direction. As a result, the force with which the movable iron core pulls the second region during swinging increases, the amplitude of the vibration of the second frequency in the second region increases, and a second sound having sufficient sound pressure can be output. Furthermore, the first frequency and the second frequency have a chordal relationship. Therefore, a chord including the first and second sounds is output from one horn.
In the above aspect, the central axis extending in the vibration direction of the movable iron core driven by the coil may be arranged to be inclined with respect to the vibration direction of the diaphragm .
  According to this aspect, since the movable iron core is inclined in the oblique direction, the vibration component is subjected to the vibration of the horizontal component in addition to the vibration of the vertical component from the movable iron core. Therefore, the sound pressure of the second sound can be further increased.
In the above aspect, the movable iron core is
A support portion that is disposed closer to the diaphragm than the center of gravity and supports the movable iron core at the fulcrum;
A main body portion connected to an end portion of the support portion on a side opposite to the fulcrum and having a center axis shifted from the center axis of the support portion in the eccentric direction may be provided.
  According to this aspect, the center of gravity of the movable iron core is shifted in the eccentric direction from the fulcrum by disposing the main body portion with the center axis shifted from the center axis of the support portion.
  In the above aspect, the length between the fulcrum and the center of gravity may be set to a length at which the target second frequency is obtained.
  According to this aspect, since the length of the fulcrum and the movable iron core is set to a length that can obtain the target second frequency, the second sound having the target second frequency is output from the diaphragm. Can do.
  According to the present invention, a chord can be output from one horn.
It is an internal block diagram of the horn which has a sound source device in embodiment of this invention. It is an external appearance block diagram of the sound source device shown in FIG. It is an internal block diagram of the sound source device shown in FIG. It is the figure which showed the cross section of the bobbin in the internal block diagram of FIG. It is the figure which compared the sound source device of this Embodiment, and the sound source device of a comparative example. It is the figure which showed the relationship between the length of the gravity center of a movable iron core, a fulcrum, and resonance. It is a figure explaining the effect | action at the time of decentering a fulcrum from the center of a diaphragm. It is the figure which showed sound pressure distribution according to the shape of a movable iron core. FIG. 9 is a close-up view of the movable iron core shown in section (a) of FIG. 8. FIG. 9 is a close-up view of the movable iron core shown in section (b) of FIG. 8. It is the figure which compared the sound pressure distribution of the 2nd vibration by the difference in the inclination direction of a movable iron core.
  FIG. 1 is an internal configuration diagram of a horn 1 having a sound source device 10 according to an embodiment of the present invention. FIG. 2 is an external configuration diagram of the sound source device 10 shown in FIG. FIG. 3 is an internal configuration diagram of the sound source device 10 shown in FIG. 4 is a diagram showing a cross section of the bobbin in the internal configuration diagram of FIG. Hereinafter, the horn 1 will be described with reference to FIGS. 1 to 4, the upper direction is referred to as the upper direction, the lower direction is referred to as the lower direction, and the direction in which the upper and lower directions are collectively referred to as the vertical direction. Further, the left direction is referred to as the left direction, the right direction is referred to as the right direction, and the left direction and the right direction are collectively referred to as the left and right direction with respect to the page. Furthermore, the vertical direction and the direction orthogonal to the horizontal direction are referred to as the front-rear direction, the direction toward the front in the front-rear direction is referred to as the front, and the direction toward the back is referred to as the rear.
  As shown in FIG. 1, the horn 1 includes a sound source device 10 that generates sound and a resonance tube 20 that is provided above the sound source device 10 and resonates with sound output from the sound source device 10.
  The sound source device 10 includes a diaphragm 11, a movable iron core 12 connected to the diaphragm 11 via a fulcrum region 1211, a fixed iron core 13 provided below the movable iron core 12, a bobbin 14 that constitutes a coil, and a winding. A case 16 that accommodates the wire 15, the movable iron core 12, the fixed iron core 13, the bobbin 14, and the winding wire 15; an outer frame 17 that attaches the outer edge of the diaphragm 11 to the outer edge of the case 16; A coil case 18 and a bracket 30 attached below the bottom surface of the case 16.
  With reference to FIG. 2, the diaphragm 11 is made of, for example, a flexible disk-shaped metal, vibrates due to the vibration of the movable iron core 12, and outputs a sound. The diaphragm 11 is mounted on a circular edge provided on the uppermost side of the case 16 and is fixed to the case 16 by being caulked by the outer frame 17. Referring to FIG. 1, the diaphragm 11 is provided with a taper 11 a in which a certain region surrounding the support portion 121 is inclined in a conical shape downward and is easily vibrated.
  The movable iron core 12 is made of a magnetic material, and includes a support part 121 connected to the diaphragm 11 via a fulcrum region 1211 and a main body part 122 provided below the support part 121.
  The support portion 121 has a columnar shape, and sandwiches the fulcrum region 1211 from both sides in the vertical direction. The support portion 121 is provided at a position where the center of the fulcrum region 1211 (hereinafter referred to as “fulcrum 121a”) is eccentric to the right from the center O of the diaphragm 11. Here, the direction in which the fulcrum 121a is eccentric (here, the right side) is described as the eccentric direction D1.
  The main body 122 is generally cylindrical in shape longer than the support 121, and the upper end of the center axis C2 is shifted in the eccentric direction D1 with respect to the center axis C1 of the support 121. The central axis C1 is directed in the vertical direction, that is, the direction orthogonal to the diaphragm 11, and passes through the fulcrum 121a. In the example of FIG. 1, the central axis C <b> 2 is inclined obliquely leftward and downward with respect to the vertical direction. Thereby, the gravity center G of the movable iron core 12 is shifted in the eccentric direction D1 from the fulcrum 121a. Specifically, the main body portion 122 includes a cylindrical columnar portion 1222 having a central axis C <b> 2 as a longitudinal direction, and a bent portion 1221 that is provided above the cylindrical portion 1222 and bends toward the support portion 121.
  In the example of FIG. 1, in order to shift the center of gravity G in the eccentric direction D1 with respect to the fulcrum 121a, the bent portion 1221 protrudes in the eccentric direction D1. Therefore, the upper surface 1221u of the bent portion 1221 is exposed.
  The fixed iron core 13 includes a pedestal portion 132, a convex portion 131 protruding in the direction of the central axis C <b> 2 from the center of the upper surface of the pedestal portion 132, and a fitting portion 133 protruding downward from the lower surface of the pedestal portion 132. Referring to FIG. 4, the pedestal portion 132 has an upper surface 132 a that is orthogonal to the central axis C <b> 2, and the bobbin 14 is placed thereon. The convex 131 enters the hole 141 provided along the central axis of the bobbin 14 and the bobbin 14 is fitted therein. Referring to FIG. 1, fitting portion 133 is fitted into a hole provided on the bottom surface of case 16. As a result, the fixed iron core 131 is fixed inside the case 16.
  The bobbin 14 is composed of a drum-shaped member around which the winding wire 15 is wound. Referring to FIG. 3, the movable iron core 12 is inserted into the bobbin 14 from above with respect to the hole 141. The diameter of the hole 141 is slightly larger than the diameter of the cylindrical portion 1222 of the movable iron core 12. Thereby, in addition to the vibration along the central axis C2, the movable iron core 12 can swing around the fulcrum 121a. With reference to FIG. 4, the lower surface of the cylindrical portion 1222 of the movable iron core 12 is in contact with the upper surface of the convex portion 131. A signal generator (not shown) is connected to the winding 15, and a first signal component having a first frequency that resonates with the diaphragm 11 and a second signal component having a second frequency that resonates with the movable iron core 12. Including a driving signal.
  Referring to FIG. 1, the coil case 18 is provided on the upper side of the pedestal portion 132 so as to cover the upper side of the bobbin 14 and the outer peripheral surface of the winding 15. A hole for inserting the movable iron core 12 into the bobbin 14 is formed in the center of the upper surface of the coil case 18. A packing 181 for supporting the movable iron core 12 is attached to the inner periphery of the hole of the coil case 18 so as to close the space with the movable iron core 12.
  Referring to FIG. 2, the case 16 includes a disk-shaped upper portion 161 and a lower portion 162 provided below the upper portion 161. The upper part 161 has a cross section concentric with the diaphragm 11. The lower portion 162 has a cross section that is concentric with the fulcrum 121a, and has a cylindrical shape that is longer in the vertical direction than the upper portion 161.
  The bracket 30 has a strip shape extending rightward from the lower surface of the lower portion 162, and a hole for attaching the horn 1 to the inside of the vehicle is provided at the right end.
  Referring to FIG. 1, the resonance tube 20 includes a main resonance tube having an opening on the upper side of the center O of the diaphragm 11 and a branch resonance tube branched from the main resonance tube. The main resonance tube and the branch resonance tube are spiral. A chord including the first sound and the second sound is input to the main resonance tube. The main resonance tube resonates with one of the first sound and the second sound, and outputs one sound from the opening 21. The branch resonance tube resonates with either the first sound or the second sound and outputs the other sound from the opening 22.
  The operation of the sound source device 10 shown in FIG. 1 will be briefly described. When a drive signal from a signal generator (not shown) is applied to the winding 15, the movable iron core 12 is driven by receiving an electromagnetic force from the winding 15. Here, since the first signal component included in the drive signal has a first frequency that resonates with the diaphragm 11, the diaphragm 11 vibrates in the vertical direction by the movable iron core 12, and the first frequency is set as a fundamental frequency. A first sound is generated. Further, since the second signal component included in the drive signal has a second frequency that resonates with the movable core 12, the movable core 12 swings around the fulcrum 121a. Thereby, the diaphragm 11 generates a second sound having the second frequency as a fundamental frequency.
  As the first frequency and the second frequency, incomplete consonance may be adopted, or complete consonance may be adopted. Here, as the first and second sounds, incomplete harmony with a frequency ratio of 1.25 is employed, but the present invention is not limited to this.
  FIG. 5 is a diagram comparing the sound source device 10 of the present embodiment and the sound source device 10J of the comparative example. In the graph of FIG. 5, a characteristic G51 indicates the frequency characteristic of the sound source device 10, and a characteristic G52 indicates the frequency characteristic of the sound source device 10J of the comparative example. In the graph of FIG. 5, the vertical axis represents sound pressure, and the horizontal axis represents frequency.
  In the sound source device 10J, the movable iron core 12J is attached to the center of the diaphragm 11J. Therefore, the characteristic G52 has only one resonance frequency observed in the vicinity of 500 Hz. On the other hand, in the sound source device 10, the movable iron core 12 is eccentrically attached to the diaphragm 11 from the center O of the diaphragm 11, and the center of gravity G of the movable iron core 12 is shifted in the eccentric direction D1. Therefore, the characteristic G51 has a resonance frequency due to resonance of the diaphragm 11 observed near 500 Hz and a resonance frequency due to resonance of the movable iron core 12 observed near 400 Hz. Accordingly, the diaphragm 11 generates a chord having a second sound (A sound) due to the resonance of the movable iron core 12 in addition to the first sound (B sound) due to the resonance of the diaphragm 11.
  FIG. 6 is a diagram showing the relationship between the center of gravity G of the movable iron core 12 and the length L of the fulcrum 121a and the resonance. The section (a) shown in the first line shows the case where the length L is L1, the section (b) shown in the second line shows the case where the length L is 0, and the section shown in the third line (C) shows a case where the length L is 2 · L1. Further, in the sections (a) to (c), the circle shown in the center indicates the sound pressure distribution 611, 612, 621, 622, 631, 632 of vibration generated in the diaphragm 11, and as the distance from the center of the concentric circles increases, The sound pressure is low. The sound pressure distributions 611, 621, 631 indicate the sound pressure distribution of vibrations (hereinafter referred to as “first vibration”) generated in the vibration plate 11 due to resonance of the vibration plate 11, and the sound pressure distributions 612, 622, 632. Indicates a sound pressure distribution of vibration (hereinafter referred to as “second vibration”) generated in the diaphragm 11 due to the resonance of the movable iron core 12.
  The frame 651 is a diagram showing the swinging motion of the movable iron core 12. In the example of the frame 651, the center diagram shows a state S1 (neutral state) in which the movable iron core 12 faces in the up-and-down direction, and the left diagram shows a state S2 in which the movable iron core 12 swings most rightward. The diagram on the right side shows a state S3 in which the movable iron core 12 is swung to the left. As shown in states S1 to S3, it can be seen that the movable iron core 12 is oscillating symmetrically due to resonance.
  Specifically, as the diaphragm 11 moves from the state S1 to the state S2, the downward deflection in the region on the left side of the fulcrum 121a increases, and the upward deflection in the region on the right side of the fulcrum 121a increases. It will increase. Further, as the state moves from the state S1 to the state S3, the vibration of the diaphragm 11 increases in the region on the left side of the fulcrum 121a and increases in the downward direction in the region on the right side of the fulcrum 121a. To go. Thereby, as shown in the sound pressure distributions 612 and 632, the second vibration has a sound pressure distribution having two peaks symmetrically with respect to the line L6 in the front-rear direction passing through the fulcrum 121a.
  Since the movable iron core 12 oscillates in the left-right direction around the fulcrum 121a, the oscillating motion of the movable iron core 12 can be considered as the oscillating motion of the pendulum with the center of gravity G around the fulcrum 121a. This is shown in the three figures shown in the left column of FIG.
  In the example of section (a), the resonance frequency of the second vibration due to the swinging motion of the pendulum having the length L = L1 was 255 Hz as shown in the sound pressure distribution 612. On the other hand, in the example of section (c), since the length is twice that of section (a), the resonance frequency of the second vibration is 1/2 the resonance frequency of section (a) as shown in sound pressure distribution 632. (= 128 Hz). In the example of section (b), the center of gravity G coincides with the fulcrum 121a, and the movable iron core 12 does not oscillate. Therefore, as shown in the sound pressure distribution 622, the second vibration does not occur.
  As described above, the swinging motion of the movable iron core 12 is considered to be the swinging motion of the pendulum having the center of gravity G. Therefore, when the length L is increased, the resonance frequency of the second vibration generated in the diaphragm 11 by the swinging motion is lowered. I understand that
  On the other hand, since the first vibration is due to the resonance of the diaphragm 11 and does not depend on the swinging motion of the movable iron core 12, the same resonance frequency of 227 Hz is obtained in the sections (a) to (c).
  Thus, the second vibration can be generated in the diaphragm 11 by providing the center of gravity G below the fulcrum 121a. However, when the center of gravity G is provided directly below the fulcrum 121a, as shown in the states S2 and S3, the second vibration generates amplitude symmetrically with respect to the fulcrum 121a. Therefore, as shown in the schematic diagram 640, the positive vibration and the negative amplitude cancel each other in the second vibration, and the sound due to the second vibration, that is, the second sound is not generated from the diaphragm 11.
  Therefore, the sound source device 10 has the fulcrum 121a eccentric from the center O of the diaphragm 11 in the eccentric direction D1, as shown in FIG. FIG. 7 is a diagram for explaining the operation when the fulcrum 121a is decentered from the center O of the diaphragm 11. FIG. Section (a) shows the state of the second vibration when the fulcrum 121a is eccentric from the center O of the diaphragm 11. FIG. In the example of section (a), the fulcrum 121a is shifted from the center O in the eccentric direction D1 (here, to the left). In this case, as shown in the schematic diagram 730 and the sound pressure distribution 711, the amplitude of the second vibration is larger on the left side than the right side with respect to the fulcrum 121a. The second sound is generated from the diaphragm 11. However, since the sound pressure of the second sound is determined by the vibration area × amplitude, the diaphragm 11 vibrates greatly only in a small area on the left side of the fulcrum 121a, and the second sound with sufficient sound pressure can be obtained. .
  Therefore, the sound source device 10 shifts the center of gravity G of the movable iron core 12 toward the eccentric direction D1. Section (b) of FIG. 7 is a diagram showing the relationship between the eccentric patterns M1, M2, M3 of the center of gravity G of the movable iron core 12 and the sound pressure distributions 721, 722, 723. The eccentric pattern M1 is a pattern in which the center of gravity G is shifted in the eccentric direction D1 with respect to the fulcrum 121a, and is the configuration of the present embodiment. The eccentric pattern M2 is a pattern in which the center of gravity G is arranged directly below the fulcrum 121a, and is the same pattern as the section (a). The eccentric pattern M3 is a pattern in which the center of gravity G is shifted in a direction opposite to the eccentric direction D1 with respect to the fulcrum 121a.
  The sound pressure distribution 722 in the eccentric pattern M2 is the same as the sound pressure distribution 711 in the section (a). In the eccentric pattern M3, as shown in the sound pressure distribution 721, in the region on the left side of the line L7 in the front-rear direction passing through the fulcrum 121a, the diaphragm 11 vibrates greatly as in the eccentric pattern M2. In the region on the right side of L7, the vibration of the diaphragm 11 is smaller than the eccentric pattern M2. Therefore, in the eccentric patterns M2 and M3, the second sound having a sufficient sound pressure cannot be obtained.
  On the other hand, in the eccentric pattern M1, the center of gravity G is shifted to the eccentric direction D1 side. Therefore, when the movable iron core 12 is swung, the diaphragm 11 is greatly pulled by the movable iron core 12 in the region on the right side of the line L7. It is done. Thereby, in the region on the right side of the line L7, the vibration of the diaphragm 11 is larger than the eccentric pattern M2. Thereby, in the eccentric pattern M1, the 2nd sound of sufficient sound pressure is obtained.
  FIG. 8 is a diagram showing a sound pressure distribution according to the shape of the movable iron core 12. In both sections (a) and (b), the center of gravity G is shifted in the eccentric direction D1, but the shape of the movable iron core 12 is different. In the section (a), the shape of the movable iron core 12 is substantially the same as the shape shown in FIGS. 1 to 4, but the section (b) is different from the shape shown in FIGS. 1 to 4. In FIG. 7, the movable iron core 12 is in a neutral state in which the longitudinal direction is perpendicular to the diaphragm 11, but in FIG. 8, the movable iron core 12 is neutral in both sections (a) and (b). In the state, the longitudinal direction is inclined with respect to the orthogonal direction of the diaphragm 11.
  FIG. 9 is a close-up view of the movable iron core 12 shown in the section (a) of FIG. FIG. 10 is a close-up view of the movable iron core 12 shown in the section (b) of FIG. Hereinafter, the movable core 12 shown in FIG. 9 will be described as the movable core 12 of the first example, and the movable core 12 shown in FIG. 10 will be described as the movable core 12 of the second example.
  The movable iron core 12 of the first example is similar to the movable iron core 12 described above with reference to FIGS. By shifting in the eccentric direction D1, the center of gravity G is shifted in the eccentric direction D1 with respect to the fulcrum 121a. However, the movable iron core 12 shown in FIG. 9 has a surface on the fulcrum 121a side of the bent portion 1221 facing the direction parallel to the central axis C2, whereas the movable iron core 12 shown in FIG. Is slightly different in that the surface on the fulcrum 121a side faces in the vertical direction. Other than that, the movable iron core 12 shown in FIG. 9 is not fundamentally different from the movable iron core 12 shown in FIG.
  In the movable core 12 of the second example, the center of gravity G is shifted in the eccentric direction D1 by inclining the main body portion 122 with the central axis C2 toward the eccentric direction D1. Specifically, the movable iron core 12 has a cylindrical shape, the center axis C1 is directed in the vertical direction, and is provided with a support portion 121 that passes through the fulcrum 121a as in the first example.
  In addition, the movable core 12 of the second example includes a substantially cylindrical main body 122 having a central axis C2 that intersects the central axis C1 at a fulcrum 121a and is inclined toward the eccentric direction D1. As a result, the movable core 12 of the second example has the center of gravity G located on the central axis C2 below the fulcrum 121a, and is shifted to the eccentric direction D1 side with respect to the fulcrum 121a. More specifically, the main body 122 includes an upper cylindrical portion 1221a provided on the support portion 121 side and a lower cylindrical portion 1222a provided below the upper cylindrical portion 1221a.
  Here, the upper cylindrical portion 1221a is made heavier than the lower cylindrical portion 1222a by making the diameter larger than that of the lower cylindrical portion 1222a. Thereby, it is prevented that the position of the center of gravity G is positioned excessively downward.
  As shown in the first row of FIG. 8, in the movable core 12 of the first and second examples, a large second vibration (here, 400 Hz) is observed in a wide region on the right side of the line L7, which is almost the same. It can be seen that the sound pressure distribution is observed. Further, as shown in the second line of FIG. 8, in the movable cores 12 of the first and second examples, the first vibration (here, 500 Hz) is observed in a wide area around the center O, which is almost the same. It can be seen that the sound pressure distribution is observed.
  As can be seen by comparing the sections (a) and (b) of FIG. 8, even if the shape of the movable iron core 12 is different, if the center of gravity G is shifted in the eccentric direction D1 from the fulcrum 121a, the sound pressure is high. First and second vibrations are obtained, and a first sound and a second sound can be generated.
  FIG. 11 is a diagram comparing the sound pressure distribution of the second vibration due to the difference in the inclination direction of the movable iron core 12. Section (a) shows the case where the movable iron core 12 is inclined toward the eccentric direction D1, and section (b) shows the case where the movable iron core 12 is inclined toward the side opposite to the eccentric direction D1. Hereinafter, the slope pattern of section (a) is referred to as a first slope pattern, and the slope pattern of section (b) is referred to as a second slope pattern. In FIG. 11, the second row shows a neutral state in both inclined patterns, and the third row shows a left maximum swing state in both inclined patterns. Further, in both the first and second inclined patterns, the center of gravity G is shifted in the eccentric direction D1 by employing the above-described movable iron core 12 of the first example.
  As can be seen by comparing the sound pressure distributions 1101 and 1102 in the sections (a) and (b), the sound pressure in the region on the right side of the line L7 is slightly higher than that in the second gradient pattern. The sound pressure in the region on the left side of the line L7 was slightly lower than that of the second inclined pattern. These differences are considered to be caused by a difference in the shift amount of the center of gravity G in the eccentric direction D1 with respect to the fulcrum 121a in the first and second inclined patterns. In any case, it can be seen that the second vibration having a sufficient sound pressure is obtained in total in both inclined patterns.
  However, as shown in the section (a), in the first inclined pattern, since the movable iron core 12 is displaced toward the eccentric direction D1, the driving members such as the fixed iron core 13 and the winding wire 15 protrude from the left end of the diaphragm 11. there is a possibility. On the other hand, as shown in the section (b), in the second inclined pattern, since the movable iron core 12 is shifted to the opposite side to the eccentric direction D1, the driving members such as the fixed iron core 13 and the winding wire 15 are It can be collected on the center O side. Therefore, the 2nd inclination pattern has the merit that sound source device 10 can be gathered up compactly.
  As shown by the first and second inclined patterns, when the movable iron core 12 is inclined, the component of the force in the left-right direction applied to the diaphragm 11 becomes larger than when the movable iron core 12 is directed vertically. Therefore, the force contributing to the second vibration is increased, and a larger second sound can be generated.
  According to the sound source device 10 described above, the diaphragm 11 resonates at the first frequency, and the first sound is output. Further, the fulcrum 121a is eccentric from the center O of the diaphragm 11, and the center of gravity G of the movable iron core 12 is shifted from the fulcrum 121a in the eccentric direction D1. Therefore, the movable iron core 12 is swung by the second frequency, and the second sound having a sufficient sound pressure can be output from the diaphragm 11. Furthermore, the first frequency and the second frequency have a chordal relationship. Therefore, the sound source device 10 can output a chord including the first and second sounds.
<Supplement>
(1) In the example of FIG. 1, the movable iron core 12 is inclined, but the movable iron core 12 is not necessarily inclined. For example, as shown in the eccentric pattern M1 in FIG. 7, the movable iron core 12 may face in the up-down direction when neutral. Even in this configuration, the second vibration having a sufficient sound pressure can be obtained as described in the sound pressure distribution 723 of FIG.
  (2) The diameter of the diaphragm 11 may be designed to have a length that resonates with the target first frequency. The movable core 12 may be designed to have a full length and a shape so that the length L between the fulcrum 121a and the center of gravity G is a length that resonates with the target second frequency.
C1 center axis C2 center axis D1 eccentric direction G center of gravity O center 1 horn 10 sound source device 11 diaphragm 12 movable core 13 fixed core 14 bobbin 15 winding 16 case 17 outer frame 18 coil case 20 resonance tube 30 bracket 121 support part 121a fulcrum 122 body portion 1211 fulcrum region 1221 bent portion 1221a upper cylindrical portion 1222 cylindrical portion 1222a lower cylindrical portion

Claims (4)

  1. A sound source device for a horn mounted on a vehicle,
    A diaphragm,
    A movable iron core connected to the diaphragm via a fulcrum;
    A drive signal including a first signal component of a first frequency that resonates with the diaphragm and a second signal component of a second frequency that resonates with the movable iron core and has a chordal relationship with the first frequency is input. And a coil for driving the movable iron core,
    The fulcrum is provided at a position eccentric from the center of the diaphragm,
    The movable iron core is a sound source device configured such that the center of gravity is shifted in the eccentric direction of the fulcrum from the fulcrum.
  2. The sound source device according to claim 1 , wherein a central axis extending in a vibration direction of the movable iron core driven by the coil is inclined with respect to a vibration direction of the diaphragm .
  3. The movable iron core is
    A support portion that is disposed closer to the diaphragm than the center of gravity and supports the movable iron core at the fulcrum;
    The main body is connected to an end portion of the support portion opposite to the fulcrum, and is disposed with a center axis shifted in the eccentric direction with respect to a center axis of the support portion. Sound source device.
  4.   The sound source device according to claim 1, wherein a length between the fulcrum and the center of gravity is set to a length at which the target second frequency is obtained.
JP2016061618A 2016-03-25 2016-03-25 Horn sound generator Active JP6197904B1 (en)

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JP2016061618A JP6197904B1 (en) 2016-03-25 2016-03-25 Horn sound generator
CN201780003082.7A CN107924672A (en) 2016-03-25 2017-03-06 The sound source of loudspeaker
DE112017000219.2T DE112017000219T5 (en) 2016-03-25 2017-03-06 Horn sound source device
US15/761,072 US10166816B2 (en) 2016-03-25 2017-03-06 Sound source device of horn
PCT/JP2017/008787 WO2017163840A1 (en) 2016-03-25 2017-03-06 Sound source device of horn

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JP2017173688A JP2017173688A (en) 2017-09-28

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CN (1) CN107924672A (en)
DE (1) DE112017000219T5 (en)
WO (1) WO2017163840A1 (en)

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JP6274285B1 (en) * 2016-09-30 2018-02-07 マツダ株式会社 Horn sound source device and horn equipped with the same

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DE10084392T1 (en) * 1999-03-29 2002-03-28 Ericsson Telefon Ab L M Vertical buzzer / vertical earpiece to reduce humming sounds
JP2000318517A (en) * 1999-05-07 2000-11-21 Mitsuba Corp Vehicle horn
IT1318298B1 (en) * 2000-08-01 2003-07-28 Fiamm Spa Electromechanical horn.
CN2683453Y (en) * 2003-12-16 2005-03-09 金锡昆 Vehicle noncontacting electric horn
CN2850186Y (en) * 2005-11-22 2006-12-20 李永慎 Electric loudspeaker
JP5410230B2 (en) 2009-10-02 2014-02-05 浜名湖電装株式会社 Electric horn for vehicles
JP5563939B2 (en) * 2010-09-22 2014-07-30 株式会社ミツバ Horn
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JP6359923B2 (en) * 2014-09-12 2018-07-18 株式会社ミツバ Horn device
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JP6373814B2 (en) * 2015-10-05 2018-08-15 丸子警報器株式会社 Vehicle horn

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JP6274285B1 (en) * 2016-09-30 2018-02-07 マツダ株式会社 Horn sound source device and horn equipped with the same

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WO2017163840A1 (en) 2017-09-28
US10166816B2 (en) 2019-01-01
DE112017000219T5 (en) 2018-08-16
JP2017173688A (en) 2017-09-28
US20180257559A1 (en) 2018-09-13
CN107924672A (en) 2018-04-17

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